<template>
    <div class="login_container">
        <div class="login_box">
            <!-- 头像区域 -->
            <div class="avatar_box">
                <img src="../assets/logo.png" alt="">
            </div>
            <!-- 登录表单区域 -->
            <el-form label-width="0px" ref="loginFormRef" :model="loginForm" :rules="loginFormRules" class="login_form">
                <!-- 用户名 -->
                <el-form-item prop="username">
                    <el-input v-model="loginForm.username" prefix-icon="el-icon-user-solid"></el-input>
                </el-form-item>
                <!-- 密码 -->
                <el-form-item prop="password">
                    <el-input v-model="loginForm.password" prefix-icon="el-icon-lock" type="password"></el-input>
                </el-form-item>
                <!-- 按钮区域 -->
                <el-form-item class="btns">
                    <el-button type="primary" @click="login">登录</el-button>
                    <el-button type="info" @click="resetloginForm">重置</el-button>
                </el-form-item>
            </el-form>
        </div>
    </div>
</template>
<script>
    export default {
        data() {
            return {
                loginForm: {
                    username: 'admin',
                    password: '123456',

                },
                //登录表单的验证规则对象
                loginFormRules: {
                    username: [{
                            required: true,
                            message: '请输入用户名',
                            trigger: 'blur'
                        },
                        {
                            min: 3,
                            max: 5,
                            message: '长度在 3 到 5 个字符',
                            trigger: 'blur'
                        }
                    ],
                    password: [{
                            required: true,
                            message: '请输入登录密码',
                            trigger: 'blur'
                        },
                        {
                            min: 6,
                            max: 15,
                            message: '长度在 6 到 15 个字符',
                            trigger: 'blur'
                        }
                    ]
                }
            }
        },
        methods: {
            //点击重置按钮，重置表单
            resetloginForm() {
                this.$refs.loginFormRef.resetFields();
            },
            //点击登录按钮进行预验证
            login() {
                this.$refs.loginFormRef.validate(async valid => {
                    console.log(valid); //预验证通过返回true,预验证失败返回false
                    if (!valid) return;
                    const {data: res} = await this.$http.post('login', this.loginForm);
                    if (res.meta.status !== 200) {
                        //element中的弹框组件
                        this.$message.error('登录失败')
                    } else {
                        this.$message.success('登录成功');
                        console.log(res);
                        //登录成功之后将token保存到sessionStrong中
                        window.sessionStorage.setItem('token',res.data.token);
                        //通过编程式导航跳转到后台主页
                        this.$router.push("/home");
                    }
                })
            }

        }

    }
</script>
<style lang="less" scoped>
    .login_container {
        background-color: #2b4b6b;
        height: 100%;
    }

    .login_box {
        width: 450px;
        height: 300px;
        background-color: #fff;
        border-radius: 3px;
        position: absolute;
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%);

        .avatar_box {
            height: 130px;
            width: 130px;
            border: 1px solid #eee;
            border-radius: 50%;
            padding: 10px;
            box-shadow: 0 0 10px #ddd;
            position: absolute;
            left: 50%;
            transform: translate(-50%, -50%);
            background-color: #fff;

            img {
                width: 100%;
                height: 100%;
                border-radius: 50%;
                background-color: #eee;
            }
        }
    }

    .btns {
        display: flex;
        justify-content: flex-end;
    }

    .login_form {
        position: absolute;
        bottom: 0;
        width: 100%;
        padding: 0 20px;
        box-sizing: border-box;
    }
</style>